Sum of Child Rows - Linked Text

Lisa Marie
Lisa Marie ✭✭✭
edited 12/09/19 in Smartsheet Basics

Hi all!

Hoping the community can help me w/this one. 

I have a database in which various quantities of part numbers are listed based on what model the system is, etc. Each of the quantities is display text (a number, i.e. "6") w/a hyperlink to the listing of the part itself in a different sheet.

I'm trying to sum up each column of parts to show how many we have of each worldwide. For the life of me, I can't figure out how to SUM child rows - anyone have a thought?

Thank you!